Since BlueOcean change log (https://plugins.jenkins.io/blueocean) highlighted blue-ocean-executor-info:
NOTE: blueocean-executor-info is now included in the main blueocean-plugin repository (but not as a required dependency yet)
JENKINS-52825Cannot see executors in Blue Ocean UI
... I gave it a try (v1.13.2 of BlueOcean-Executor-Info Plugin that was kind of merged into BlueOcean-Plugin, I think), but later on found massive log spam in the Jenkins log file:
(and I really mean massive).